NTSB Probable Cause

THE PILOT'S FAILURE TO MAINTAIN THE MINUMUM DESCENT ALTITUDE (MDA) WHILE ON A NON-PRECISION INSTRUMENT APPROACH. FACTORS WHICH CONTRIBUTED TO THE ACCIDENT WERE: THE FLIGHT SERVICE STATION (FSS) SPECIALIST'S FAILURE TO PROVIDE THE PUBLISHED NOTICE TO AIRMEN (NOTAM) INFORMATION TO THE PILOT DURING THE WEATHER BRIEFING, AND THE CONTROLLER'S FAILURE TO REMEMBER THAT THE VOR-A APPROACH WAS NOT AUTHORIZED.